Let the added resistance due to the corrosion be r1 is added. The current in the motor will be calculated as:
Voltage in the motor is expressed as:
An automobile starter motor has an equivalent resistance of 0.0500 Ω and is supplied by a 12.0-V battery with a 0.0100-Ω internal resistance. If the battery connections are corroded and add 0.0900 Ω to the circuit. (Significant problems are caused by even small amounts of unwanted resistance in low-voltage, high-current applications.)
(a) What is the current to the motor?
(b) What voltage is applied to it?
(c) What power is supplied to the motor?
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